> They react to their environment. That's the classifier.

An industrial robot arm, out of the box, only has internal sensing (joint position, torque etc) and a start/stop button - can't sense the external environment at all.

But I've got a light on my porch that turns on when it gets dark.

By the 'react to the environment' definition the former is not a robot, and the latter is.

It would have to have a force torque sensor which interacts with the environment around it (aka the object being manipulated). Hence it being a robot arm.

However if indeed an industrial arm doesn't have that, then yes robot is the wrong term for it.